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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7f5ac4ade5827be662fc9fdfcd4683f2179914ec262d0359eca789e82a70070' 
  AND token = 'gOioKEqROELjKXHe3ng5K2TOftsUDNFWbqVltc46Lz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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