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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edc965e18f1e0856c838d95b8026aa3252f455309a413b47e86f9efe3571cfa8' 
  AND token = 'Qy1SFbeCoNYRmwjBVI1+iaKrRWNpLSdfZOLJxDaj1cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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