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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6daf9245b93131ef8ef52dd49eea773742abdd48fcf7e91ae50d5b12d5bd02c8' 
  AND token = 'bb0bEFw5Tn0Z/VmMyv6l0WRlpSSpb4VGQW44MJ9yRs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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