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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f283b91fa5e82efb9d1aeaa0e02fd6a7fd2fbd0e253bcfc7fc156f2642b2a8ff' 
  AND token = '4C836bM6dfhi00rRW8KyectK4YIhXimCMUE041lASU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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