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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '515d4c4208425b4e7bc29c8dd7c1b0792d06a8e0a0c2caa025dc74eec85c57a0' 
  AND token = 'y3dKgmyF1jxQ6BOp4t9PIxj1ffI3/xlO01M6bdyiBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}