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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70d552eac187b2a8289e3fde583a2a11dd0c5012876c8d343ee13f2449819215' 
  AND token = 'dHjNpOtkRd9aJFlpIKg6vj2q12Yb+1w9JpfHwJ8R9E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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