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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c50c95be7c5922951206fff0a06c1c92aed2d9b776dab27c36b9481ce33b615a' 
  AND token = 'Q78xe1+oViR+FK7U7Xab590xWJCwfmrun3lwo7NvoVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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