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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30d4c68d0c02d956f743f2e971b98f309d5cad832cbb837db21d361cfdf35c20' 
  AND token = 'UqSPZ9wIBoYLR7IYso6pkl6ak1pMN6E3T55N9sNQPAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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