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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30b664624d3bf7a7a7074faaf4e015c27ae59268dde85c9b219fd24684ccca5c' 
  AND token = 'cjzOiP2BAclkN1y6Uzlr2zQCr0QEeLyt5W7U5Qt0YwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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