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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '266c6982946a97a02a5a53b2679abbe83b1a80b573c8b380fdd1f62119dac887' 
  AND token = 'oI6549vsnV3Z5+n3y1ilps3baUFSOnLkO5koFp6f0gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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