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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aba20dd753f12a11ac5270884c66124457fb76a29e4af1c62209201ea0c01413' 
  AND token = 't0CKPMhhHNOr5xSvNxnxbKIXpfMfPzVgKu+FrfCHpAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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