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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3b76470e271bffef1083fe1c4786a8d614f2216dc50e8bfc456969f6821b29c' 
  AND token = 'u8z2sRdtvlWn7A5yo2wi07ATW292HlcZ9EsaaefV69A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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