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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fca7db833de9af6905db0105a1a9e1b34388cb24b70eadc6be55b6ed23bbce1' 
  AND token = 'x6ajrfoY8yiztyFcilkmEubjmQCqaW8lmywLzD5l5Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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