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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0b8cdd7d0cf81b51e9a3dceff641821ad9e0b6f69cf75bc9a5ccf518e330a1b' 
  AND token = '1IOZwMS+x1vJ9K77Bg0yssKwDMf7Nk3G3e3KsBJSDRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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