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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a6ee21b415b99fc9e0543d76ad9f9495e4eac82c956de1bf25f53aa650d59c5' 
  AND token = 'ypa8hHPc5JBpR8CJWho5J0/W5vcgAFYdp9n1ry2ytSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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