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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b4c98b595c6c0bba98952f0a14ec20ebf521ff2f9902e21a80532bbea934d66' 
  AND token = 'DdHXxkm5f8VvLX+SHopt2FG/FmSmOofj2HOF3n+eK/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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