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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef2faf4db51bafe3e9ecb019c8171c98f2a463bdf8c1b4782dd901497c08ee25' 
  AND token = '12T5+eldxUhDopDXHG/NxaB+TBjmW7o5lTM1ReD0SsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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