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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73a3c2ca71e9c294b940564431fd00aedae43c04e7f53f44513b4f1a20a404a0' 
  AND token = 'Edjucik4EKqPNTUnrsFb6hJNKfKZOSZGwARGABsFF0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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