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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55754d4baa52ddcdb50f6577c92dda3d2df9a035310976e2b0e0e5691251296e' 
  AND token = 'jvNonp6LbuKsXira1XoDTWWlCqfoO8c+ECMh+INbmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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