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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2d4383c30e73cc0f3791459952cff802dbd4d62d7ec163b12dbe7aa4d778d9' 
  AND token = 'pqyNMy/nbPk3CT2DYlcZrXT4Ij6qk7AFT77TsLuU+eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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