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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b033d41ef2b78ab42d9aebb62c811cc3e747aec4f9d5616f52b93c801dbf8733' 
  AND token = '8uP2ZEqWooch2rCc76uFEhDAP9NOfaPwdzv+xowazic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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