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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b34bf3db411a06715379b1b192f14c3dd7a7c9a627465b9f759e2102d4e4c59' 
  AND token = 'o8I/m2hkFIObdhz+i+SPWepIzMWrLna9mzrskYtuoq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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